[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 Mike S. changed: What|Removed |Added Status|NEW |RESOLVED Resolution|---

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #16 from Christian König --- (In reply to Mike S. from comment #15) > So thank you for the patch, and I hope it can get into 3.19. Alex has added it to his -fixes branch, so it either ends up in 3.19 or in 3.20. Can you close the bu

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #15 from Mike S. --- Thanks again for the info. I have been running the Radeon driver with the patch to limit the reference divider to 7 for a week now, and I can confirm that apart from that original incident, it has been very stable

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #14 from Christian König --- (In reply to Mike S. from comment #13) > So, from your explanation, using a ref_div of 7 compared to 2, means that > the VCO is running at a higher frequency, and hence, higher voltage. So I > assume that

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #13 from Mike S. --- Wow, thank you very much for the detailed explanation :-) Though all I was really expecting was a "yes/no or not sure" answer to whether the new higher values of fb_dev & ref_div on my RS780 could be responsible

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #12 from Christian König --- (In reply to Mike S. from comment #11) > Thanks for the info. It hasn't happened again so far. > > > ... you are driving the PLL so close to the edge ... > Can you please explain what you mean? Are you sa

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #11 from Mike S. --- Thanks for the info. It hasn't happened again so far. > ... you are driving the PLL so close to the edge ... Can you please explain what you mean? Are you saying that the higher fb_div & ref_div are pushing the PL

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #10 from Christian König --- (In reply to Alex Deucher from comment #9) > (In reply to Mike S. from comment #8) > > Thanks for the explanation. > > > > Can I suggest that you delay committing this patch for a week or so - I want > >

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #9 from Alex Deucher --- (In reply to Mike S. from comment #8) > Thanks for the explanation. > > Can I suggest that you delay committing this patch for a week or so - I want > to check that it is really stable. Yesterday I had one inc

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #8 from Mike S. --- Thanks for the explanation. Can I suggest that you delay committing this patch for a week or so - I want to check that it is really stable. Yesterday I had one incident where the screen froze with diagonal coloured

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #7 from Christian König --- (In reply to Mike S. from comment #6) > I can confirm that the patch > https://bugzilla.kernel.org/attachment.cgi?id=163891 to cap ref_div to 7 > fixes the problem on my RS780. I did the test on kernel 3.18

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #6 from Mike S. --- I can confirm that the patch https://bugzilla.kernel.org/attachment.cgi?id=163891 to cap ref_div to 7 fixes the problem on my RS780. I did the test on kernel 3.18.3. Note that I also cast the number 7 in the min() t

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 Christian König changed: What|Removed |Added CC||deathsimple at vodafone.de --- Comment

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #4 from Mike S. --- I haven't yet tested the patch to cap ref_div to 7, but here are the values reported with drm.debug=0xE, in case they are useful: 1. Kernel 3.14 (working): 14851, fb: 145.2 ref: 2, post: 7 2. Kernel 3.18 (not work

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #3 from Mike S. --- I have never built Linux before, but I'll give it a go. It might take me several days. If I might make a suggestion, it would be nice you could set those divider values as boot params. -- You are receiving this

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 Alex Deucher changed: What|Removed |Added CC||alexdeucher at gmail.com --- Comment #2 fr

[Bug 91861] [Radeon RS780] Blank screen (no signal) on HDMI after boot in 3.15 & later

https://bugzilla.kernel.org/show_bug.cgi?id=91861 --- Comment #1 from Mike S. --- Sorry, the Ubuntu versions should be 14.04 & 14.10 of course. Mike -- You are receiving this mail because: You are watching the assignee of the bug.