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I bought a Lenovo L520 with Intel HD 3000 Graphics. I installed Ubuntu 11.04 latest release. When i start up the laptop by default I get the start sound and then I see vertical colored lines flickering on the menubar and the mouse pointer which I can move. I fixed this problem already by editing the startup script in GRUB adding nomodeset. Now it starts up normally. But the problem is that the resolution is 1024*786 and this is also the highest resolution available. The display window says something like unknown, so I think that there are no correct driver installed. I also made a software update. What have I done wrong? 11.04 should have Intel HD 3000 support?

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closed as off topic by Marco Ceppi Feb 2 '12 at 23:55

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try removing "nomodeset" but instead use "i915.semaphores=1" - does this work? –  fossfreedom Sep 23 '11 at 12:56
yes, perfect. thanks. –  Peter Sep 26 '11 at 14:29
excellent news - I've posted this as an answer. Please can you click the tick button to accept. –  fossfreedom Sep 26 '11 at 14:53
Hello, this appears to be this bug, which will be fixed in an upcoming release. –  Jjed Feb 2 '12 at 22:38

2 Answers 2

nomodeset turns off Kernel Modesetting (KMS) - this can (and does) impact the resolutions detected by the kernel.

My recommendation would be to look at using an alternative grub boot option such as i915.semaphores=1 - this enables kernel semaphores which can help with stability & graphical issues.

To make this change permanent on GRUB2 installations, change the following kernel command line entry in /etc/default/grub and re-running sudo update-grub to make that change permanent.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.semaphores=1"
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Updating grub-gfxpayload-lists helped me on my Thinkpad L520.

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