Re: BUG: blank screen - unless keyboard/synaptic combo
From: Niel Lambrechts
Date: Thu May 21 2009 - 18:41:22 EST
On 05/19/2009 08:38 PM, Niel Lambrechts wrote:
I have a strange problem in that during a resume from hibernate my
text console (or X) remains blank - that is, until I simultaneously
press a keyboard key and touch the synaptic pad. It is not sufficient
to press just one or the other, it needs to be done simultaneously and
it resumes fine after doing this.
I have tried quite hard to overcome this issue. All of the following
hibernation tests I tried involved booting into a text console, without
ever starting X. With each test I still had a blank screen upon resume,
and each time it was fully recoverable by pressing any keyboard
key/synaptic pad touch combo.
1. Disabling a CPU core - NO CHANGE.
Based on a "multi-processor concurrency" fix mentioned on the web
(Ubuntu bug #272307).
2. Upgrade BIOS to latest level - NO CHANGE.
BIOS 6FET70WW, released 04/17/2009.
3. Switching to ATI Mobility Radeon HD 3650 graphics card. NO CHANGE.
My Lenovo W500 has "switchable graphics" BIOS option, and I tried this
test with both the integrated or the above-mentioned card without
difference.
_This result seems quite interesting to me, as if it could be some type
of bus related freeze where the keyboard/synaptic combo plays a role._
4. Disabling BIOS Options - NO CHANGE.
Enabling/disabling security chip features + TXT features.
Disabling fingerprint reader.
Disabling memory security feature.
5. Kernel options - NO CHANGE.
ACPI debugging - I enabled CONFIG_ACPI_DEBUG, but did not see any
messages generated when I pressed a keyboard key + synaptic mousepad
combo that recovers the console.
FIRMWARE_EDID - still testing this.
Any suggestions on anything else I could try would be most welcome...!
Thanks,
Niel
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/