Messages in this thread | | | Date | Mon, 21 Apr 2014 16:54:15 -0400 | Subject | Re: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display | From | Alex Deucher <> |
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On Mon, Apr 21, 2014 at 4:32 PM, Ken Moffat <zarniwhoop@ntlworld.com> wrote: > I've just built 3.15.0-rc2 on this box, and discovered that I get a > blank screen. The boot appears to complete (it sends me information > from SMART which is from my last bootscript), and it responds to > MagicSysRQ to reboot. I tried to login and run startx, but that > didn't seem to make any difference - possibly something went wrong, > it wasn't in my history when I booted a good kernel. > > This machine uses a regular old VGA cable to connect it, the > following lines in dmesg make me think it has chosen the wrong > connector:
VGA is implemented as a DP to VGA bridge on APUs.
> > Apr 21 19:32:45 bluesbreaker kernel: [ 1.273246] > [drm:radeon_dp_link_train_cr] *ERROR* displayport link status failed > Apr 21 19:32:45 bluesbreaker kernel: [ 1.273247] > [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed > Apr 21 19:32:45 bluesbreaker kernel: [ 1.295116] Console: > switching to colour frame buffer device 85x34 > > On a boot with 3.14.0 and earlier I get a different console size - > Apr 21 20:42:44 bluesbreaker kernel: [ 1.445992] Console: > switching to colour frame buffer device 133x54 > > My console font is 12x22, and my screen is 1600x1200 but it looks > as if 3.15-rc2 has fallen back to trying to use 1024x768. > > I'm attaching what look like the relevant parts of the messages > from the system logs for 3.15-rc2 and 3.14.0. > > Any ideas, please ? This is an AMD A4-5300 APU and not the world's > fastest machine for bisecting :-(
I'd guess it's either the pll rework patches or the switch to the common dp helper code patches. It would be helpful if you could bisect.
Alex
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