Thanks Alex - Iâ??ll try the latest kernels first and see where that gets me. Iâ??ll move on to trying to track down a commit if that fails... Itâ??s a dell 27â?? monitor connected via DVI dual - nothing else along the path so a fairly straightforward setup. Ian On Mon, 2 Apr 2018 at 20:21, Alex Deucher <alexdeucher at gmail.com> wrote: > On Mon, Apr 2, 2018 at 10:29 AM, Ian Bashford <ianbashford at gmail.com> > wrote: > > Hi, > > I'm investigating an issue with KMS on my graphics card. I'm hoping this > > list might give me some direction/guidance where to look. > > > > Sometime in between kernels 4.9 and 4.14, the KMS on my card stopped > getting > > set to 2560x1440 and only sets 1920x1080. Passing video= as a kernel > > parameter just leads to a black screen. > > I've tried stock kernels on alpine and arch, and also compiled a few as > > well; I can't see any obvious differences in the compile options that > might > > lead to the difference. > > My next line of enquiry is to see if there's a change in amdgpu that > might > > be the cause. > > Given the size of the codebase and the number of changes, I was hoping > > someone might be able to help me narrow the possible search. > > > > Would you be able to suggest somewhere to begin ? > > If you can try a newer kernel (4.16 or 4.17rc), try enabling the new > dc modeseting code (append amdgpu.dc=1 on the kernel command line in > grub). > > What type of display (DVI, DP, etc.) is your monitor and what physical > connector is it connected to on your board? Are there any adapters > between the card and the display? Probably best to file a bug > (https://bugs.freedesktop.org) and attach your xorg log and dmesg > output in both the working and non working cases. > > The best way to sort this out would be to use git to bisect what > commit caused the issue. > > Alex > > > > > The card is a Sapphire R9 380X NITRO 4GB - it identifies as a TONGA. > > > > During the boot, I get this message about the mode setting > > [drm] initializing kernel modesetting (TONGA 0x1002:0x6938 0x174B:0xE308 > > 0xF1) > > > > thanks > > Ian > > > > _______________________________________________ > > amd-gfx mailing list > > amd-gfx at lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx > > > _______________________________________________ > amd-gfx mailing list > amd-gfx at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx > -- Cheers Ian -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20180403/e7d74b7b/attachment.html>
