Lady Fitzgerald wrote: ⤴Fri May 20, 2022 6:45 pm
I just tried something different. I first installed the NVIDIA update, then tried all the kernel parameters, again, deleting the text following "quiet splash". No joy, none of them worked.
I was just getting ready to post and I see you figured out this out.
Lady Fitzgerald wrote: ⤴Fri May 20, 2022 6:45 pmOne thing that still bothers me is why won't the underscore appear on the screen when I type it in?
It is there. I do not know why it is not appearing on the screen.
Do you have any recollection of those kernel parameters being added to your system?
I've seen quite a few
vt_handoff=7
(notice there is an underscore there) and that usually indicates to which virtual console (#7) will show the display manager. It may be the number is already set up in one of your grub files. Perhaps that is why it is
$vt_handoff
without a number and with the
$
. You can ignore that.
I'm not familiar with the first one which I think is
nvida.NVreq_Enable_BacklightHandler=1
(with several underscores so this is one parameter). I found a reference to it on the Nvidia developer's forum on this topic
NVreg_EnableBacklightHandler removed. Reading that topic, it indicates a change happened in between the Nvidia-460 and Nvidia-465 drivers. Considering you keep going back to the Nvidia-460, that seems to correlate with your issue. In that thread, the person wants it because they have a dual-graphics laptop. That is not your situation.
I did some more hunting and found
this Nvidia readme for an older driver (Nvidia-455 which is before the one with which you are noticing issues) under
Known Notebook Issues there is a bullet point:
When available, the NVIDIA driver installs a backlight handler that allows access to the driver's backlight controller through /sys/class/backlight/nvidia_0. This option can be disabled by passing the
NVreg_EnableBacklightHandler=0
parameter to the nvidia kernel module.
which is a slightly different parameter than what you have (unless I misread what you typed) and your parameter appears to enable this function. That is odd if that is what the file does anyhow.
I pulled up the same chapter from the Nvidia-470.74 (I happened to have the specific version number handy) and it has that same note. I tried some other driver numbers but kept getting page not found so they must have made changes to the documentation.
Try a boot with the newer Nvidia driver and just delete the
nvida.NVreq_Enable_BacklightHandler=1
. Do not add any other parameters and you can leave (or not) the
$vt_handoff
.