[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Package changed: linux-5.4 (Ubuntu Focal) => linux (Ubuntu Focal) ** Changed in: linux (Ubuntu Focal) Status: In Progress => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu.

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

This bug was fixed in the package linux-oem-osp1 - 5.0.0-1043.48 --- linux-oem-osp1 (5.0.0-1043.48) bionic; urgency=medium * bionic/linux-oem-osp1: 5.0.0-1043.48 -proposed tracker (LP: #1867111) * All PS/2 ports on PS/2 Serial add-in bracket are not working after S3 (LP:

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

This bug was fixed in the package linux-oem-osp1 - 5.0.0-1043.48 --- linux-oem-osp1 (5.0.0-1043.48) bionic; urgency=medium * bionic/linux-oem-osp1: 5.0.0-1043.48 -proposed tracker (LP: #1867111) * All PS/2 ports on PS/2 Serial add-in bracket are not working after S3 (LP:

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

verified fixed with proposed kernel on dell xps15 2-in-1. Device: Mesa Intel(R) HD Graphics 630 (KBL GT2) (0x591b) ** Tags removed: verification-needed-focal ** Tags added: verification-done-focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- focal' to 'verification-done-focal'. If the problem still exists, change the tag

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Also affects: linux-oem-osp1 (Ubuntu) Importance: Undecided Status: New ** Also affects: linux-oem-osp1 (Ubuntu Bionic) Importance: Undecided Status: New ** Also affects: linux-5.4 (Ubuntu Bionic) Importance: Undecided Status: New ** No longer affects: linux-5.4

Re: [Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

On 2020-03-02 07:53:18, AceLan Kao wrote: > Here is the test kernel and the patches I reverted/applied, could > anyone helps me verify it. I can confirm that the new kernel does _not_ regress brightness controls on the machine that caused me to initially open this bug report. Thanks! -- You

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Description changed: + [Impact] + After Ubuntu-5.4.0-9.12 which introduce DPCD backlight patches, the + backlight control on some platforms fail to work. + It seems using OUI string to map the panels which support DPCD + backlight doesn't work well, it mis-mapped

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

This kernel fixes the issue on XPS 9370 at my hand. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled To manage

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

Here is the test kernel and the patches I reverted/applied, could anyone helps me verify it. This kernel fixes the Dell machine I have which uses the DPCD backlight, I hope this won't introduce regressions you've encountered. https://people.canonical.com/~acelan/bugs/lp1861521/ -- You

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

BTW, before the new patch is ready, you can add a kernel cmdline to disable the DPCD backlight i915.enable_dpcd_backlight=0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title:

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

There is a new patchset switches to use EDID-based DP quirk to list those DPCD backlight panel. I'll try verifying the new method and submit new SRU patches. https://patchwork.kernel.org/cover/11376657/ ** Changed in: linux-5.4 (Ubuntu Focal) Status: Confirmed => In Progress -- You

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

FWIW I'm seeing this on a XPS 13 9370 as well cwayne@groot:~$ glxinfo |grep Device Device: Mesa Intel(R) UHD Graphics 620 (KBL GT2) (0x5917) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

I enabled the KMS debug messages in the drm module: $ cat /etc/modprobe.d/drm-debug.conf options drm debug=0x04 $ sudo update-initramfs -u -k $(uname -r) && sudo reboot ... Unfortunately, it doesn't look like my device_id is set after the drm_dp_read_desc() in drm_dp_read_desc: $ dmesg | grep

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

Note that the quirks in the debug output from comment #9 are 0x because I've got still got commit 3269788061d2 ("USUNTU: SAUCE: drm/i915: Force DPCD backlight mode on Dell Precision 4K sku") reverted locally. -- You received this bug notification because you are a member of Ubuntu Bugs,

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Tags added: champagne -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled To manage notifications about this bug go to:

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

To provide further verification, I built Ubuntu-5.4-5.4.0-14.17 with a single patch on top that reverts commit 3269788061d2 ("USUNTU: SAUCE: drm/i915: Force DPCD backlight mode on Dell Precision 4K sku"). My screen brightness controls are working again and I can undock from my external monitor

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

I noticed that upstream v5.4.18 allowed me to adjust my screen brightness while Ubuntu-5.4-5.4.0-14.17 does not, which indicates an Ubuntu SAUCE patch as the culprit. I bisected between the two kernels and this was the result: $ git bisect good 3269788061d24e316633165608259de1c110b801 is the

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

Another Gen 9 GPU that I have is not affected by this bug: $ glxinfo | grep Device Device: Mesa DRI Intel(R) HD Graphics 515 (Skylake GT2) (0x191e) $ cat /proc/version_signature Ubuntu 5.4.0-12.15-generic 5.4.8 I can increase and decrease the brightness without any issues. -- You

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Also affects: linux-5.4 (Ubuntu Focal) Importance: Medium Status: Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title: [FOCAL][REGRESSION] Intel Gen 9 brightness

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Package changed: linux-signed-5.4 (Ubuntu) => linux-5.4 (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled To

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

Also I should have mentioned that 5.3.0-24-generic as a workaround also fixed it for me. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861521 Title: [FOCAL][REGRESSION] Intel Gen 9 brightness

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

I also am hitting this. This looks to be a gen 9 graphics problem, as sforshee with gen 10 graphics appears unaffected. I'm on a Dell Inspiron 5540 with an i9-9880H $ glxinfo | grep Device Device: Mesa DRI Intel(R) UHD Graphics 630 (Coffeelake 3x8 GT2) (0x3e9b) @tyhicks reported on

[Bug 1861521] Re: [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled

** Summary changed: - [FOCAL][REGRESSION] HP EliteBook 840 G5 screen brightness cannot be controlled + [FOCAL][REGRESSION] Intel Gen 9 brightness cannot be controlled -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu.