On Mon, 6 Aug 2018 02:38:28 -0400 Philip Webb wrote: > 180805 Philip Webb wrote: > > 180804 Andrew Savchenko wrote: > >> Your xorg.conf -- or a file from xorg.conf.d directory -- > >> must contain the following : > >> > >> Section "Device" > >> Identifier "Card1" > >> Driver "modesetting" > >> ... (some options may follow) > >> EndSection > > I've done that, as described in my previous msg, without success. > > Then I noticed that Wiki says the kernel needs recompiling > with 'Drivers->Graphics-><*>DirectRenderingManager > <*>NouveauCards' ;
Well, that was too obvious to mention :) > I also unset the "<->Backlight ... " just below, as I don't need it. > The new kernel is noticeably bigger than the previous version ; > I copied it to /boot as usual, updated lilo.conf & ran Lilo ; > the new kernel (called 4.14.52b) booted successfully, > but neither Nouveau nor Nvidia would start ; > even worse, neither would start with the previous version 4.14.52 , > which had been working with Nvidia for some time. > > The kernel log stops after several repeats of the lines : > > kernel: nvidia: Unknown symbol backlight_device_unregister (err 0) > kernel: nvidia: Unknown symbol backlight_device_register (err 0) You need to rebuild nvidia-drivers. As a rule of thumb after each kernel update (or major config change) one must rebuild external kernel modules: emerge -av @module-rebuild > Finally, I booted into kernel 4.9.95 & Nvidia still starts there. > > This is turning into a nightmare. It all started when 4.14.52 > couldn't find my scanner, which 4.9.16 had no trouble with, > & then I found I couldn't test 4.9.16, as Nvidia no longer worked with it. > To test 4.9.16 it seems sensible to try Nouveau instead of Nvidia, > but that has led to a further tangle. > > I suspect the problem with the scanner is that the Epson driver > needs an update to work with the most recent kernels. > That's something I'll have to take up with Epson, if I can. What is your scanner model? Are you using sane-epson2 and the latest sane version? It really shouldn't depend on the kernel unless you are missing some crucial (e.g. usb) drivers. > However, the Nouveau/Nvidia mess is something I sb able to sort out. > Can anyone suggest what's gone wrong & how to put it right ? You have not stated what is wrong with your Nouveau + kernel 4.14.52 setup. Please provide Xorg logs. Best regards, Andrew Savchenko
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