iMac 10,1 with Ubuntu 16.04: black screen after suspend

[Florian Echtler]

On 01.06.2017 19:53, Alex Deucher wrote:
> On Thu, Jun 1, 2017 at 4:27 AM, Florian Echtler <floe at butterbrot.org> wrote:
>> On 31.05.2017 14:57, Alex Deucher wrote:
>>> On Wed, May 31, 2017 at 5:21 AM, Lukas Wunner <lukas at wunner.de> wrote:
>>
>> Here's the (substantial) dmesg output, with drm.debug=0xf:
>> http://floe.butterbrot.org/external/radeon/dmesg_after_suspend
>>
>> I haven't been able to find any references to link training, though.
> 
> I need your dmesg from boot to confirm the display topology, but eDP
> with r7xx asics was pretty rare.  I suspect your system just uses
> LVDS; as such there is no link training involved.

I've updated the trace with increased log_buf_len so nothing is truncated:

http://floe.butterbrot.org/external/radeon/dmesg_after_suspend.txt

(trace now contains a full boot including suspend and wakeup)

However, what I'm seeing now does sound like the internal connection is indeed eDP:

[  166.816162] [drm:drm_mode_setcrtc] [CRTC:34:crtc-0]
[  166.816166] [drm:drm_mode_setcrtc] [CONNECTOR:40:eDP-1]
[  166.816167] [drm:drm_crtc_helper_set_config]
[  166.816169] [drm:drm_crtc_helper_set_config] [CRTC:34:crtc-0] [FB:54]
#connectors=1 (x y) (0 0)
[  166.816170] [drm:drm_crtc_helper_set_config] crtc has no fb, full mode set
[  166.816172] [drm:drm_mode_object_reference] OBJ ID: 40 (4)
[  166.816173] [drm:drm_crtc_helper_set_config] encoder changed, full mode switch
[  166.816174] [drm:drm_crtc_helper_set_config] crtc changed, full mode switch
[  166.816174] [drm:drm_crtc_helper_set_config] [CONNECTOR:40:eDP-1] to
[CRTC:34:crtc-0]
[  166.816175] [drm:drm_crtc_helper_set_config] attempting to set mode from
userspace
[  166.816177] [drm:drm_mode_debug_printmodeline] Modeline 65:"" 0 241500 2560
2608 2640 2720 1440 1443 1448 1481 0x0 0x9
[  166.816180] [drm:radeon_encoder_set_active_device] setting active device to
00000002 from 00000002 00000002 for encoder 3
[  166.816183] [drm:radeon_get_monitor_bpc] eDP-1: Display bpc=8, returned bpc=8
[  166.816185] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[  166.816186] [drm:radeon_get_monitor_bpc] eDP-1: Display bpc=8, returned bpc=8
[  166.816188] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[  166.816192] [drm:drm_crtc_helper_set_mode] [CRTC:34:crtc-0]
[  166.816208] [drm:radeon_get_monitor_bpc] eDP-1: Display bpc=8, returned bpc=8
[  166.816210] [drm:radeon_atom_encoder_dpms] encoder dpms 30 to mode 3, devices
00000008, active_devices 00000000
[  166.816213] [drm:radeon_atom_encoder_dpms] encoder dpms 22 to mode 3, devices
00000010, active_devices 00000000
[  166.816235] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[  166.816237] [drm:radeon_compute_pll_avivo] 360000 - 360000, pll dividers -
fb: 80.0 ref: 2, post 3
[  166.824475] done.

... and a bit later:

[  166.853787] [drm:radeon_dp_link_train_cr] clock recovery at voltage 0
pre-emphasis 0
[  166.853788] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[  166.855953] [drm:radeon_dp_link_train_ce] channel eq at voltage 0 pre-emphasis 0

Best, Florian
-- 
SENT FROM MY DEC VT50 TERMINAL

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