Bug 41732

Summary: [radeon] KMS (and X.org) detect wrong outputs
Product: Drivers Reporter: Niels Ole Salscheider (niels_ole)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: RESOLVED PATCH_ALREADY_AVAILABLE    
Severity: normal CC: alan, alexdeucher
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.1-rc3 Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg output
xorg log
dmesg output with drm.debug=4
edid for display connected to LVDS
vbios

Description Niels Ole Salscheider 2011-08-25 16:53:02 UTC 
On my notebook, 6520G (mobile A6 APU), KMS detects a screen on VGA-0 although there is no attached. Because of that it chooses a lower resolution than the internal display's native resolution. The selected mode causes the internal display to flicker, though.

In dmesg, I can see the following:

[drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[drm:atom_execute_table_locked] *ERROR* atombios stuck executing E3E6 (len 2585, WS 4, PS 4) @ 0xEAD0

Other issues I have with this :
- xrandr reports a size of 0x0 inches for the internal display
- the internal display uses only 6 bit/pixel and there seems to be no way to enable dithering
- the brightness controls do not work although there is a sysfs acpi interface that gets updated
- the display does not come back on after standby

These issues may be unrelated and I will create further bug reports if so, but maybe they give a hint concerning this issue.
Comment 1 Alex Deucher 2011-08-25 16:57:07 UTC 
Please attach your xorg log and dmesg output.
Comment 2 Niels Ole Salscheider 2011-08-25 16:59:42 UTC 
Created attachment 70172 [details]
dmesg output
Comment 3 Niels Ole Salscheider 2011-08-25 17:01:00 UTC 
Created attachment 70182 [details]
xorg log
Comment 4 Niels Ole Salscheider 2011-08-29 12:44:23 UTC 
When I run rmmod radeon and insmod radeon after standby via ssh the screen stays black, too.

It seems that the radeon module cannot find any edid information at all.

Is there anything I can do to debug this further?
Comment 5 Niels Ole Salscheider 2011-09-02 14:03:30 UTC 
Created attachment 71332 [details]
dmesg output with drm.debug=4

note: radeon_fp_native_mode gets calld for LVDS although get-edid can find valid edid data for it (see next attachment)
Comment 6 Niels Ole Salscheider 2011-09-02 14:04:51 UTC 
Created attachment 71342 [details]
edid for display connected to LVDS
Comment 7 Alex Deucher 2011-09-02 14:24:26 UTC 
Please attach a copy of your vbios:

(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom
Comment 8 Niels Ole Salscheider 2011-09-02 14:31:03 UTC 
Created attachment 71362 [details]
vbios
Comment 9 Niels Ole Salscheider 2011-09-07 16:12:16 UTC 
Additional info: All calls to i2c_transfer in drm_do_probe_ddc_edid fail with return code -6.
Comment 10 Alan 2012-08-30 10:48:35 UTC 
Is this problem still seen ?
Comment 11 Niels Ole Salscheider 2012-08-30 22:20:42 UTC 
This issue is fixed in recent kernels.