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curmudgeon
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PostPosted: Mon Mar 09, 2015 5:11 am    Post subject: another problem with newer kernels Reply with quote

I have deleted this post from a similar topic below, since it will probably be dealt better with by itself.

I have a laptop (Dell d620) that works fine with an older kernel (gentoo-3.12.13), but won't successfully boot anything after that. It is running x86 with an Nvidia card using the nouveau driver).

I see all of the boot messages, but as soon as X starts, the display goes completely black, and while I can still ssh in, I can't really do much else with no display. :)

The X.org logs are virtually the same between the kernels (the working kernel has ten more lines at the end):

http://dpaste.com/1XMNJAV

http://dpaste.com/3SG5TH1

And here is the config for the kernel I am having problems with:

http://dpaste.com/0HFG4X7

This is really frustrating, and any help anyone can give as far as diagnosing (and remedying) this would be greatly appreciated.
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Keruskerfuerst
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PostPosted: Sat Mar 14, 2015 7:45 pm    Post subject: Reply with quote

The pastebin links are no longer vaild.
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s0be
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PostPosted: Sat Mar 14, 2015 10:26 pm    Post subject: Reply with quote

This sounds like the system is detecting the wrong backlight control by default. If you can ssh in, try poking at things in /sys/class/backlight/*/brightness to see if anything can get the screen to turn on. There may be 2 different entries there (one like nv_backlight, and one like acpi_backlight). Quite likely, one will work, and one won't. If setting a value in one of them turns the screen on, there should be a kernel command line option that will 'fix' it's behavior, and reporting it to upstream will make it work by default.
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