Launchpad has imported 49 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=91393.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2015-07-19T11:17:16+00:00 Furniss-tom wrote: Created attachment 117243 dmesg Consistently flickering screen when i915 driver is used with the N133HSE-EA3 screen of the Lafite 13.3 laptop. Video here: https://www.youtube.com/watch?v=0ISthkP7L3o When i915 driver is disabled (i915.modeset=0), Linux falls back to the vesa driver and the laptop screen renders correctly. When an external monitor is connected via HDMI, the i915 driver renders the external monitor correctly whilst the flickering remains on the laptop screen. Earlier versions of this laptop model did not experience this problem, but the most recent version does (reported by one other user). I have no authoritative record of the hardware changes between model versions. System information: - Architecture and kernel: 4.2.0-994-generic #201507142205 SMP Wed Jul 15 02:06:50 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux - Distribution: Ubuntu 15.04 - Laptop model: Lafite 13.3 from www.pcspecialist.co.uk - Laptop Screen: Chimei N133HSE-EA3 - Display Conenctor: eDP $ sudo get-edid | edid-decode Extracted contents: header: 00 ff ff ff ff ff ff 00 serial number: 0d ae 61 13 00 00 00 00 07 18 version: 01 04 basic params: a5 1d 11 78 02 chroma info: ce 85 a3 57 4e 9d 26 12 50 54 established: 00 00 00 standard: 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 descriptor 1: 36 36 80 a0 70 38 20 40 2e 1e 24 00 25 a5 10 00 00 18 descriptor 2: 24 24 80 a0 70 38 20 40 2e 1e 24 00 25 a5 10 00 00 18 descriptor 3: 00 00 00 fe 00 43 4d 4e 0a 20 20 20 20 20 20 20 20 20 descriptor 4: 00 00 00 fe 00 4e 31 33 33 48 53 45 2d 45 41 33 0a 20 extensions: 00 checksum: a1 Manufacturer: CMN Model 1361 Serial Number 0 Made week 7 of 2014 EDID version: 1.4 Digital display 8 bits per primary color channel DisplayPort interface Maximum image size: 29 cm x 17 cm Gamma: 2.20 Supported color formats: RGB 4:4:4 First detailed timing is preferred timing Established timings supported: Standard timings supported: Detailed mode: Clock 138.780 MHz, 293 mm x 165 mm 1920 1966 1996 2080 hborder 0 1080 1082 1086 1112 vborder 0 -hsync -vsync Detailed mode: Clock 92.520 MHz, 293 mm x 165 mm 1920 1966 1996 2080 hborder 0 1080 1082 1086 1112 vborder 0 -hsync -vsync ASCII string: CMN ASCII string: N133HSE-EA3 Checksum: 0xa1 EDID block does NOT conform to EDID 1.3! Missing name descriptor Missing monitor ranges $ sudo lshw -c video *-display description: VGA compatible controller product: Broadwell-U Integrated Graphics vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:50 memory:b1000000-b1ffffff memory:c0000000-cfffffff ioport:4000(size=64) $ glxinfo | grep -i vendor server glx vendor string: SGI client glx vendor string: Mesa Project and SGI OpenGL vendor string: Intel Open Source Technology Center $ glxinfo | grep -i render direct rendering: Yes GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth, GL_MESA_texture_signed_rgba, GL_NV_conditional_render, GL_NV_depth_clamp, GL_ARB_conditional_render_inverted, GL_ARB_conservative_depth, GL_NV_conditional_render, GL_NV_depth_clamp, GL_NV_light_max_exponent, GL_OES_element_index_uint, GL_OES_fbo_render_mipmap, Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/0 ------------------------------------------------------------------------ On 2015-07-19T11:18:11+00:00 Furniss-tom wrote: Created attachment 117244 intel-reg-dumper Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/1 ------------------------------------------------------------------------ On 2015-07-19T11:18:44+00:00 Furniss-tom wrote: Created attachment 117245 edid file Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/2 ------------------------------------------------------------------------ On 2015-07-19T11:19:26+00:00 Furniss-tom wrote: Created attachment 117246 xrandr --verbose Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/3 ------------------------------------------------------------------------ On 2015-07-19T14:17:03+00:00 Furniss-tom wrote: Created attachment 117247 xorg log Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/4 ------------------------------------------------------------------------ On 2015-08-03T21:25:20+00:00 Jesse Barnes wrote: Does i915.enable_ips=0 help at all? Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/5 ------------------------------------------------------------------------ On 2015-08-04T14:27:49+00:00 Furniss-tom wrote: (In reply to Jesse Barnes from comment #5) > Does i915.enable_ips=0 help at all? Same symptoms were observed with i915.enable_ips=0. Kernel is drm- intel-nightly 4.2.0-994.201508010158 Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/6 ------------------------------------------------------------------------ On 2015-08-17T21:26:30+00:00 Rodrigo-vivi wrote: Hi Tom, Please let me know the status of few feature while you get this: sudo cat /sys/kernel/debug/dri/0/i915_edp_psr_status sudo cat /sys/kernel/debug/dri/0/i915_fbc_status sudo cat /sys/kernel/debug/dri/0/i915_ips_status Thanks, Rodrigo. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/7 ------------------------------------------------------------------------ On 2015-08-20T13:52:47+00:00 Furniss-tom wrote: (In reply to Rodrigo Vivi from comment #7) > Hi Tom, > Please let me know the status of few feature while you get this: > > sudo cat /sys/kernel/debug/dri/0/i915_edp_psr_status > > sudo cat /sys/kernel/debug/dri/0/i915_fbc_status > > sudo cat /sys/kernel/debug/dri/0/i915_ips_status > > Thanks, > Rodrigo. Hi Rodrigo - those directories (beyond /sys/kernel) don't exist on my system. Do I need to enable some kind of additional logging? Thanks Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/8 ------------------------------------------------------------------------ On 2015-09-10T09:40:43+00:00 Oscar Morante wrote: Hi, I think I'm running into the same problem on my machine. But in my case it only happens after the screen goes to sleep (locking in gnome) and sometimes it stays completely black instead of flickering. You can also see that it renders some garbage from time to time. https://www.youtube.com/watch?v=YL_9IRsx8Lo I'm using the kernel packages from Arch Linux's repositories and it only started happening with version 4.2 (which is on Arch's testing repo right now). It works fine with 4.1.6 (in the core repo) except for occasional 1 frame blackouts. System information: - Architecture and kernel: 4.2.0-3-ARCH #1 SMP PREEMPT Fri Sep 4 20:59:11 UTC 2015 x86_64 GNU/Linux - Distribution: Arch Linux - Laptop model: Razer Blade 14" (2015) - Laptop Screen: (I don't know how to check this :?) - Display Conenctor: eDP I don't see any errors in any of my logs when this happens. Is there any debug setting I can use that can help you get more information? Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/9 ------------------------------------------------------------------------ On 2015-09-10T12:49:45+00:00 Jani-nikula wrote: I'd like to get an intel_reg dump output ('intel_reg dump' replaces intel_reg_dumper in recent http://cgit.freedesktop.org/xorg/app/intel- gpu-tools/) for both before and after loading i915. Alternatively, with i915.modeset=0 and i915.modeset=1. It should be interesting to see the difference in register values for both cases. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/10 ------------------------------------------------------------------------ On 2015-09-10T14:32:53+00:00 Furniss-tom wrote: (In reply to Jani Nikula from comment #10) > I'd like to get an intel_reg dump output ('intel_reg dump' replaces > intel_reg_dumper in recent > http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/) for both before and > after loading i915. Alternatively, with i915.modeset=0 and i915.modeset=1. > It should be interesting to see the difference in register values for both > cases. Hi Jani, I am away from the laptop right now but should be able to provide the additional information in a few days. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/11 ------------------------------------------------------------------------ On 2015-09-11T11:01:42+00:00 Oscar Morante wrote: Is there any guide I can follow to dump the registers before the module is loaded? I did a quick test passing `break=postmount` to the kernel and chrooting into the rootfs but I couldn't manage to get intel_reg to work like this. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/12 ------------------------------------------------------------------------ On 2015-09-16T14:31:05+00:00 Mm-v wrote: Same problem here on the Pentium brodwell GT1 model (TopStar U731). Does it affect any kernel ? Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/13 ------------------------------------------------------------------------ On 2015-09-21T13:37:23+00:00 Furniss-tom wrote: (In reply to Jani Nikula from comment #10) > I'd like to get an intel_reg dump output ('intel_reg dump' replaces > intel_reg_dumper in recent > http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/) for both before and > after loading i915. Alternatively, with i915.modeset=0 and i915.modeset=1. > It should be interesting to see the difference in register values for both > cases. I've uploaded two files: - i915.modeset0.txt - i915.modeset1.txt Both contain the output of the command "intel_reg dump", one with i915.modeset=0, one with i915.modeset=1. intel-gpu-tools is version 1.11. Kernel is drm-intel-next, 4.2.0-997-generic #201509120200 SMP Sat Sep 12 02:02:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/14 ------------------------------------------------------------------------ On 2015-09-21T13:38:29+00:00 Furniss-tom wrote: Created attachment 118383 intel_reg dump with i915.modeset=0 Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/15 ------------------------------------------------------------------------ On 2015-09-21T13:40:51+00:00 Furniss-tom wrote: Created attachment 118384 intel_reg dump with i915.modeset=1 Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/16 ------------------------------------------------------------------------ On 2015-09-30T13:34:32+00:00 Oscar Morante wrote: If it helps, this is the output of intel_reg dump before and after it happens for me. This is the sequence: 1) Boot into a gnome 3 desktop (everything works fine) 2) intel_reg dump > intel_reg-dump-ok 3) Lock the screen with gnome (turns off the display) 4) Unlock the screen (here I start getting the flickering) 5) intel_reg dump > intel_reg-dump-flickering Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/17 ------------------------------------------------------------------------ On 2015-09-30T13:35:27+00:00 Oscar Morante wrote: Created attachment 118538 intel_reg dump before the flicker happens Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/18 ------------------------------------------------------------------------ On 2015-09-30T13:36:12+00:00 Oscar Morante wrote: Created attachment 118539 intel_reg dump while the flicker is happening Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/19 ------------------------------------------------------------------------ On 2015-10-01T09:14:03+00:00 Jani-nikula wrote: (In reply to Oscar Morante from comment #17) > If it helps, this is the output of intel_reg dump before and after it > happens for me. This is the sequence: > > 1) Boot into a gnome 3 desktop (everything works fine) > 2) intel_reg dump > intel_reg-dump-ok > 3) Lock the screen with gnome (turns off the display) > 4) Unlock the screen (here I start getting the flickering) > 5) intel_reg dump > intel_reg-dump-flickering Oscar, please add drm.debug=14 module parameter, and attach dmesg all the way from boot to repeating the above (no need to redo the dumps, just 1,3,4). Make sure you capture the dmesg for a sequence that reproduces the issue. Thanks. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/20 ------------------------------------------------------------------------ On 2015-10-01T16:48:36+00:00 Oscar Morante wrote: Created attachment 118563 dmesg with drm.debug=14 (boot -> gnome -> lock -> unlock -> flicker) There you go. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/21 ------------------------------------------------------------------------ On 2015-10-01T16:50:13+00:00 Oscar Morante wrote: Created attachment 118564 dmesg with drm.debug=14 (boot -> gnome -> lock -> unlock -> flicker) Oops! I mixed up the files. This is the good one. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/22 ------------------------------------------------------------------------ On 2015-10-08T10:05:14+00:00 Oscar Morante wrote: I received an update from Arch Linux and now instead of flickering it stays completely black (but it turns on). [2015-10-08 08:53] [ALPM] upgraded xf86-video-intel (1:2.99.917+472+gf0fd4d5-1 -> 1:2.99.917+476+g4e668dd-1) The Arch package doesn't apply any patches and it get's the source straight from git, notice the git SHA's between the "+g" and "-1". I'll upload more debug logs later. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/23 ------------------------------------------------------------------------ On 2015-10-11T08:08:44+00:00 Oscar Morante wrote: Nevermind, I went to capture the logs and now I get the flicker every time... I guess it was just coincidence. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/24 ------------------------------------------------------------------------ On 2015-10-23T14:32:54+00:00 Oscar Morante wrote: Reverting these commits "fixes" the problem on my machine :) - https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/patch/?id=4e96c97742f4201edf1b0f8e1b1b6b2ac6ff33e7 - https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/patch/?id=5fa836a9d85975c5f0f1219669523c1f0ac64349 Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/25 ------------------------------------------------------------------------ On 2015-10-23T14:37:41+00:00 Mm-v wrote: Great news Oscar Morante ! Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/26 ------------------------------------------------------------------------ On 2015-10-25T06:51:17+00:00 Oscar Morante wrote: Yes, I hope it help to find a proper fix :) Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/27 ------------------------------------------------------------------------ On 2015-10-26T13:52:30+00:00 Jani-nikula wrote: (In reply to Oscar Morante from comment #25) > Reverting these commits "fixes" the problem on my machine :) > > - > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/patch/ > ?id=4e96c97742f4201edf1b0f8e1b1b6b2ac6ff33e7 > - > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/patch/ > ?id=5fa836a9d85975c5f0f1219669523c1f0ac64349 commit 4e96c97742f4201edf1b0f8e1b1b6b2ac6ff33e7 Author: Mika Kahola <mika.kah...@intel.com> Date: Wed Apr 29 09:17:39 2015 +0300 drm/i915: eDP link training optimization commit 5fa836a9d85975c5f0f1219669523c1f0ac64349 Author: Mika Kahola <mika.kah...@intel.com> Date: Wed Apr 29 09:17:40 2015 +0300 drm/i915: DP link training optimization Cc: Mika. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/28 ------------------------------------------------------------------------ On 2015-11-02T08:12:18+00:00 Jani-nikula wrote: Please try this patch: http://patchwork.freedesktop.org/patch/msgid/1446223656-27792-1-git- send-email-ville.syrj...@linux.intel.com Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/29 ------------------------------------------------------------------------ On 2015-11-02T08:40:21+00:00 Twisted-fall wrote: I'm having the same problem on 4.2.x and 4.3 and patch suggested by Jani Nikula doesn't help. Reverting the patches mentioned by Oscar Morante fixes the problem for both 4.2.x and 4.3 Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/30 ------------------------------------------------------------------------ On 2015-11-20T13:14:13+00:00 Mika-kahola wrote: Created attachment 119983 Make DP fast link training option as module parameter I wasn't able to replicate this issue of flickering screen with the HW that I had available. However, that doesn't rule out the fact that there truly is a problem. It seems that there are panels out there that simply doesn't like to start DP link training with non-zero values. The patch here makes this fast link training feature as one module parameter (/sys/module/i915/parameters/enable_dp_flt) so you can enable or disable the feature depending on panel support. By default this feature is disabled. The patch applies to drm-intel-nightly. Please, give this patch a try and report back with dmesg log if the problem still exists. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/31 ------------------------------------------------------------------------ On 2015-11-24T13:45:37+00:00 Lorebett wrote: I was experiencing the same problem after upgrading to Kubuntu 15.10, kernel 4.2.0-18-generic (Dell m3800); the flickering happens if I switch from a lower resolution than the maximal one, 3200x1800, e.g., 1920x1080). I tried to apply the latest patch, but it does not apply since I guess it's too new for the sources of 4.2.0-18-generic. However, reverting the two commits as mentioned in https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25 fixes the problem for me as well! Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/32 ------------------------------------------------------------------------ On 2015-11-24T14:22:10+00:00 Furniss-tom wrote: I applied the patch and it resolved my flickering problem. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/33 ------------------------------------------------------------------------ On 2015-11-25T07:39:33+00:00 Kimmo Nikkanen wrote: Assigning to our QA for verification Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/34 ------------------------------------------------------------------------ On 2015-11-25T10:14:09+00:00 Mika-kahola wrote: (In reply to Tom Furniss from comment #33) > I applied the patch and it resolved my flickering problem. Thank you for testing! Unfortunately, it turned out we cannot upstream that patch as we do not want to add additional module parameters. Instead, we need to come up with another kind of solution. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/35 ------------------------------------------------------------------------ On 2015-11-25T10:23:40+00:00 Mika-kahola wrote: Created attachment 120109 DP configuration check This patch adds additional test and disables fast link training feature if DP link parameters such as link bandwidth, rate selection, lane count, port clock and bpp. If one of these parameter change the fast link training is disabled and link is retrained with the link training parameters starting from zero values. Please, give this patch a go and report back with dmesg if flickering still exists. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/36 ------------------------------------------------------------------------ On 2015-12-01T12:09:31+00:00 Kimmo Nikkanen wrote: Lowering the priority. This is not blocking our work and we haven't been able to reproduce the problem on our side. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/37 ------------------------------------------------------------------------ On 2015-12-01T17:32:35+00:00 Lorebett wrote: (In reply to Mika Kahola from comment #36) > Created attachment 120109 [details] [review] > DP configuration check > > This patch adds additional test and disables fast link training feature if > DP link parameters such as link bandwidth, rate selection, lane count, port > clock and bpp. If one of these parameter change the fast link training is > disabled and link is retrained with the link training parameters starting > from zero values. Please, give this patch a go and report back with dmesg if > flickering still exists. To which kernel should this patch be applied? Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/38 ------------------------------------------------------------------------ On 2015-12-02T06:47:14+00:00 Mika-kahola wrote: (In reply to Lorenzo Bettini from comment #38) > (In reply to Mika Kahola from comment #36) > > Created attachment 120109 [details] [review] [review] > > DP configuration check > > > > This patch adds additional test and disables fast link training feature if > > DP link parameters such as link bandwidth, rate selection, lane count, port > > clock and bpp. If one of these parameter change the fast link training is > > disabled and link is retrained with the link training parameters starting > > from zero values. Please, give this patch a go and report back with dmesg if > > flickering still exists. > > To which kernel should this patch be applied? This should apply to drm-intel-nightly. I received a feedback concerning this patch and I updated it. An updated version can be found https://patchwork.freedesktop.org/patch/66697/ Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/39 ------------------------------------------------------------------------ On 2015-12-04T04:10:15+00:00 Luke-hutchison wrote: I see significant flickering for about 2-3 minutes every time I resume from RAM in Fedora 23 (kernel 4.2.6-300.fc23.x86_64). The problem was also present in Fedora 22. - External monitor (Crossover brand), connected via DP - Intel HD Graphics 4600 Strangely, sometimes opening a terminal window with black background (even in non-fullscreen mode) stops the flickering, but if I minimize the window again, the flickering resumes. I don't see anything strange in the logs. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/40 ------------------------------------------------------------------------ On 2015-12-04T07:34:15+00:00 Mika-kahola wrote: That is a bit strange. Could you provide a dmesg log with the option drm.debug=0xe? Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/41 ------------------------------------------------------------------------ On 2015-12-04T16:29:28+00:00 Furniss-tom wrote: (In reply to Mika Kahola from comment #36) > Created attachment 120109 [details] [review] > DP configuration check > > This patch adds additional test and disables fast link training feature if > DP link parameters such as link bandwidth, rate selection, lane count, port > clock and bpp. If one of these parameter change the fast link training is > disabled and link is retrained with the link training parameters starting > from zero values. Please, give this patch a go and report back with dmesg if > flickering still exists. Hi Mika. Your second patch also fixes the problem for me. After removing your first patch and applying the second the flickering issue did not recur. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/42 ------------------------------------------------------------------------ On 2015-12-05T11:00:17+00:00 flux242 wrote: hi, I'm also experiencing bad flickering of my laptop screen. I have installed xubuntu 15.10 on Acer C740: a@chrome:~$ sudo lshw -c video *-display description: VGA compatible controller product: Broadwell-U Integrated Graphics vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 08 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:43 memory:e0000000-e0ffffff memory:d0000000-dfffffff ioport:1800(size=64) a@chrome:~$ uname -a Linux chrome 4.2.0-19-generic #23-Ubuntu SMP Wed Nov 11 11:39:30 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux But today display was blanked after 15 minutes of inactivity and when I woken it up I saw no more flickering and this kernel message: Dec 5 10:16:48 chrome kernel: [ 3708.390613] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training please suggest a way (usingn a kernel parameter) to disable link training until a bugfix is backported Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/46 ------------------------------------------------------------------------ On 2015-12-05T14:19:32+00:00 flux242 wrote: (In reply to flux242 from comment #43) > hi, I'm also experiencing bad flickering of my laptop screen. > I have installed xubuntu 15.10 on Acer C740: > > a@chrome:~$ sudo lshw -c video > *-display > description: VGA compatible controller > product: Broadwell-U Integrated Graphics > vendor: Intel Corporation > physical id: 2 > bus info: pci@0000:00:02.0 > version: 08 > width: 64 bits > clock: 33MHz > capabilities: msi pm vga_controller bus_master cap_list rom > configuration: driver=i915 latency=0 > resources: irq:43 memory:e0000000-e0ffffff memory:d0000000-dfffffff > ioport:1800(size=64) > > a@chrome:~$ uname -a > Linux chrome 4.2.0-19-generic #23-Ubuntu SMP Wed Nov 11 11:39:30 UTC 2015 > x86_64 x86_64 x86_64 GNU/Linux > > But today display was blanked after 15 minutes of inactivity and when I > woken it up I saw no more flickering and this kernel message: > Dec 5 10:16:48 chrome kernel: [ 3708.390613] [drm:intel_dp_start_link_train > [i915]] *ERROR* failed to enable link training > > please suggest a way (usingn a kernel parameter) to disable link training > until a bugfix is backported I need to add some additional info. Ive managed to reproduce the case when after screen blanking there's no flickering anymore. I start the 'xset dpms force off' command to blank the screen and after a pause I press a button to wake it up. Below is a pastebin when flickering persist after waking up: http://pastebin.com/fuY57tMH And here is a pastebin when the flickering is gone after waking up: http://pastebin.com/4gGMTycL It was really difficult to reproduce the case when the flicker is gone Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/47 ------------------------------------------------------------------------ On 2015-12-06T10:03:02+00:00 Furniss-tom wrote: Just wanted to summarise the progress against the original problem, which may or may not be related to some of these other issues, and to add some test detail. The original problem was a continually flickering screen, starting part- way through boot and prior to the login screen, and affected the extended display port of the laptop screen only, not external monitors. Mika's original patch fixed this issue, removing the flicker, but during QA Mika was asked to modify it to remove kernel parameters. Mika's revised (second) patch also resolved the issue. With both of Mika's patches there were still some graphics issues: 1) Initial blank screen on boot. 2) Occasional blinking of the graphics, ranging from every few seconds to every 2-3 minutes. The blink lasted only a fraction of a second, and whilst noticeable it wasn't a major concern. 3) The flickering returned when resuming from sleep. Issue 1 was a relatively common brightness issue, and was resolved by using kernel parameter acpi_osi=linux, and running this command automatically on startup, "setpci -s 00:02.0 F4.B=00". This also resolved issue 2, removing the occasional blink. Issue 3 remains. Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/48 ------------------------------------------------------------------------ On 2015-12-06T16:26:36+00:00 Oscar Morante wrote: I applied the latest patch from Mika on top of drm-intel-nightly and it's been working great for the last couple of days. Suspending or changing resolution doesn't cause flicker anymore, and it also seems to have fixed the ocassional one frame blackout I had before (which still happens on windows btw). I didn't need any extra configuration like Tom, it just worked out of the box. I'll let you know if something changes but it seems to be fixed on my system. Thanks! Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/49 ------------------------------------------------------------------------ On 2015-12-07T14:15:25+00:00 Mika-kahola wrote: (In reply to Oscar Morante from comment #46) > I applied the latest patch from Mika on top of drm-intel-nightly and it's > been working great for the last couple of days. Suspending or changing > resolution doesn't cause flicker anymore, and it also seems to have fixed > the ocassional one frame blackout I had before (which still happens on > windows btw). > > I didn't need any extra configuration like Tom, it just worked out of the > box. I'll let you know if something changes but it seems to be fixed on my > system. > > Thanks! Great to hear that the patch worked out for you! Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/50 ------------------------------------------------------------------------ On 2015-12-07T15:00:12+00:00 Mika-kahola wrote: Created attachment 120389 Check if DP training set applied ok Tom reported that flickering occurs when resuming back from the sleep. When resuming we are already trained the DP link and most probably reusing the DP link parameters when retraining the link. It may be possible that setting the DP training pattern fails yielding an error message of "*ERROR* failed to enable link training". This patch introduces a check to the routine that applies the DP training pattern. If this check fails, the link training is restarted by setting the parameters to zero. The patch applies on top of the latest drm-intel-nightly and requires this https://patchwork.freedesktop.org/patch/66697/ patch to be applied Reply at: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1522922/comments/51 ** Changed in: nouveau Status: Unknown => Incomplete ** Changed in: nouveau Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libdrm in Ubuntu. https://bugs.launchpad.net/bugs/1522922 Title: Screen flickering in Intel i915 driver Status in Nouveau Xorg driver: Incomplete Status in libdrm package in Ubuntu: Confirmed Bug description: There's an upstream bug reported here https://bugs.freedesktop.org/show_bug.cgi?id=91393 that causes screen flickering when using the Intel i915 builtin driver (at resolutions lower than the maximal one). I think that it will be fixed in newer kernel versions, but for the time being, as reported here https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25 (and as personally tested) reverting those two commits fixes the problem. Would that be possible to release a fixed version for the 4.2.0 stream? ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-19-generic 4.2.0-19.23 ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6 Uname: Linux 4.2.0-19-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bettini 1378 F.... pulseaudio /dev/snd/controlC1: bettini 1378 F.... pulseaudio CurrentDesktop: KDE Date: Fri Dec 4 19:01:00 2015 HibernationDevice: RESUME=UUID=7ddbc972-3ad6-40de-9313-2bb9395145f9 InstallationDate: Installed on 2015-05-08 (210 days ago) InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: Dell Inc. Dell Precision M3800 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=UUID=dd2c7064-53b9-4720-96ab-5e8a3f2db3ea ro noprompt quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.2.0-19-generic N/A linux-backports-modules-4.2.0-19-generic N/A linux-firmware 1.149.3 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: Upgraded to wily on 2015-11-07 (26 days ago) dmi.bios.date: 08/17/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A10 dmi.board.name: Dell Precision M3800 dmi.board.vendor: Dell Inc. dmi.board.version: A10 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvrA10:bd08/17/2015:svnDellInc.:pnDellPrecisionM3800:pvrA10:rvnDellInc.:rnDellPrecisionM3800:rvrA10:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Dell Precision M3800 dmi.product.version: A10 dmi.sys.vendor: Dell Inc. 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