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Um, what's the problem?

Um, what's the problem?

Posted Jul 8, 2010 9:12 UTC (Thu) by pfavr (guest, #38205)
In reply to: Um, what's the problem? by dwmw2
Parent article: Ask a kernel developer

The problem that led me to ask this question is that I'm using a Lenovo X201 laptop (with ultrabase X200 dockingstation) to drive my HP LP3065 30" monitor (2560x1600). It sort of works, but occasionally (approx. 20 times a day) the screen goes black for half a second then comes back on again.

I've tried replacing the monitor (HP sent me a replacement) as well as cables, and the HP DisplayPort-to-dual-link-DVI-adapter used in my setup.

The X201 has a core i5 CPU with integrated Intel HD graphics (which also drives the DisplayPort output on the dockingstation.

I use Debian GNU/Linux "sid" 64bit and have had the best result using the stock Debian kernel.

As can be seen from the dmesg output there is a problem with parsing the EDID info coming from the monitor. Looking a bit closer it seems all bytes are repeated 4 times: HHHHPPPP and so on.

So I thought I might be able to help solving this problem, but where to start? I did know that grepping kernel sources would be a start but I think the article is really good because now I feel more "safe" posting an email to the relevant people and mailing list :-)

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Um, what's the problem?

Posted Jul 10, 2010 12:58 UTC (Sat) by alankila (guest, #47141) [Link]

This is interesting. I have a 30" monitor at 2560x1600, and it also goes black for about half a second once after a cold boot. It takes variable time for it to occur, usually in the order of 10 minutes, so it interrupts my work, but after it does it once, it works for the rest of the session.

I've never seen any clues for this strange behavior. I've not considered replacing the monitor, because this one works otherwise and I already played the warranty dance for a few months thanks to severe quality problems with Samsung SyncMaster 305T+.

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