https://bugs.freedesktop.org/show_bug.cgi?id=93021
Bug ID: 93021 Summary: Sometimes External Monitor stays black after resuming from suspend Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon Assignee: dri-devel@lists.freedesktop.org Reporter: holthuis.jan@googlemail.com
Sometimes my external monitor (Acer X223W) stays black (powersave mode) when resuming from suspend. I'm using a HP ProBook 6465b (Llano/Sumo, AMD A6-APU, Radeon HD6520G). The Monitor is connected to the DVI port of my HP docking station (P/N: VB044AV).
My Desktop Environment (GNOME 3) still thinks it's connected, so some windows aren't visible anymore.
Workarounds: - Press WIN+P to disable the second monitor and use the Laptop screen only - Power off the external monitor and then switch it on again. It then starts to work again.
Some more information: $ dmesg | tail -n 2 [ 7977.467770] [drm:radeon_dp_link_train [radeon]] *ERROR* displayport link status failed [ 7977.467815] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed
$ uname -a Linux jan-laptop 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015 x86_64 GNU/Linux
$ glxinfo | grep OpenGL | grep string OpenGL vendor string: X.Org OpenGL renderer string: Gallium 0.4 on AMD SUMO (DRM 2.43.0, LLVM 3.7.0) OpenGL core profile version string: 3.3 (Core Profile) Mesa 11.0.5 OpenGL core profile shading language version string: 3.30 OpenGL version string: 3.0 Mesa 11.0.5 OpenGL shading language version string: 1.30 OpenGL ES profile version string: OpenGL ES 3.0 Mesa 11.0.5 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
$ xrandr Screen 0: minimum 320 x 200, current 3046 x 1050, maximum 8192 x 8192 VGA-0 disconnected (normal left inverted right x axis y axis) LVDS connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 173mm 1366x768 60.10*+ 1280x720 59.86 1152x768 59.78 1024x768 59.92 800x600 59.86 848x480 59.66 720x480 59.71 640x480 59.38 DisplayPort-0 disconnected (normal left inverted right x axis y axis) DisplayPort-1 disconnected (normal left inverted right x axis y axis) DisplayPort-2 connected 1680x1050+1366+0 (normal left inverted right x axis y axis) 474mm x 296mm 1680x1050 59.95*+ 1600x1200 60.00 1400x1050 59.95 1280x1024 75.02 1440x900 74.98 59.90 1280x960 60.00 1360x768 59.80 1152x864 75.00 1024x768 75.08 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 640x480 75.00 72.81 66.67 60.00 720x400 70.08
$ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 18 model : 1 model name : AMD A6-3410MX APU with Radeon(tm) HD Graphics stepping : 0 microcode : 0x3000027 cpu MHz : 1000.000 cache size : 1024 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt arat cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter vmmcall bugs : fxsave_leak sysret_ss_attrs bogomips : 3195.26 TLB size : 1536 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate cpb
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