<div><div dir="auto">Thanks Alex - I’ll try the latest kernels first and see where that gets me. </div><div dir="auto">I’ll move on to trying to track down a commit if that fails...</div><div dir="auto"><br></div><div dir="auto">It’s a dell 27” monitor connected via DVI dual - nothing else along the path so a fairly straightforward setup. </div><div dir="auto">Ian </div><div dir="auto"><br></div><div dir="auto"><br></div><br><div class="gmail_quote"><div>On Mon, 2 Apr 2018 at 20:21, Alex Deucher <<a href="mailto:alexdeucher@gmail.com">alexdeucher@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Mon, Apr 2, 2018 at 10:29 AM, Ian Bashford <<a href="mailto:ianbashford@gmail.com" target="_blank">ianbashford@gmail.com</a>> wrote:<br>
> Hi,<br>
> I'm investigating an issue with KMS on my graphics card. I'm hoping this<br>
> list might give me some direction/guidance where to look.<br>
><br>
> Sometime in between kernels 4.9 and 4.14, the KMS on my card stopped getting<br>
> set to 2560x1440 and only sets 1920x1080. Passing video= as a kernel<br>
> parameter just leads to a black screen.<br>
> I've tried stock kernels on alpine and arch, and also compiled a few as<br>
> well; I can't see any obvious differences in the compile options that might<br>
> lead to the difference.<br>
> My next line of enquiry is to see if there's a change in amdgpu that might<br>
> be the cause.<br>
> Given the size of the codebase and the number of changes, I was hoping<br>
> someone might be able to help me narrow the possible search.<br>
><br>
> Would you be able to suggest somewhere to begin ?<br>
<br>
If you can try a newer kernel (4.16 or 4.17rc), try enabling the new<br>
dc modeseting code (append amdgpu.dc=1 on the kernel command line in<br>
grub).<br>
<br>
What type of display (DVI, DP, etc.) is your monitor and what physical<br>
connector is it connected to on your board? Are there any adapters<br>
between the card and the display? Probably best to file a bug<br>
(<a href="https://bugs.freedesktop.org" rel="noreferrer" target="_blank">https://bugs.freedesktop.org</a>) and attach your xorg log and dmesg<br>
output in both the working and non working cases.<br>
<br>
The best way to sort this out would be to use git to bisect what<br>
commit caused the issue.<br>
<br>
Alex<br>
<br>
><br>
> The card is a Sapphire R9 380X NITRO 4GB - it identifies as a TONGA.<br>
><br>
> During the boot, I get this message about the mode setting<br>
> [drm] initializing kernel modesetting (TONGA 0x1002:0x6938 0x174B:0xE308<br>
> 0xF1)<br>
><br>
> thanks<br>
> Ian<br>
><br>
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</blockquote></div></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><br>Cheers<br><br>Ian</div>