Bug 15850 - Switcheroo: LVDS on radeon not working after suspend
Summary: Switcheroo: LVDS on radeon not working after suspend
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel) (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_video-dri
Depends on:
Reported: 2010-04-25 20:37 UTC by Michał Witkowski
Modified: 2013-11-20 13:29 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.34-rc4
Tree: Mainline
Regression: No

Dmesg after resume with not working LVDS (54.88 KB, application/octet-stream)
2010-04-25 20:37 UTC, Michał Witkowski

Description Michał Witkowski 2010-04-25 20:37:29 UTC
Created attachment 26139 [details]
Dmesg after resume with not working LVDS

Lenovo Ideapad U330 with Radeon 3450 and Intel 4500MHD
Arch Linux current with kernel 2.6.34-rc4 (+switchable graphics).

LVDS doesn't come back after suspend while HDMI does with or without X server.

Ways to reproduce:
1. Start into console (init 3)
2. Load modules in this order: i915, radeon, fbcom
3. cat DDIS > $STATE
4. pm-suspend
5. Press any key to resume the system
8. *bam*. LVDS is off (backlight is off, no garbage, no cursor) and HDMI works.

1. Before using switchable graphics (in Discrete only BIOS setting) suspend resumed cleanly in X and in console.
2. I guess this might have something to do with the order I'm loading the modules
2. My guess is: radeon tries to bring up only LVDS-0 and not LVDS-1. After switcheroo, my LVDS is named LVDS-1 in radeon and LVDS-0 in intel, regardless of which one is used. HDMI is only available in radeon as HDMI-0 and it gets resumed.

Will attach dmesg.

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