Morning Alan,

On Thursday, 29 December 2022 19:50:18 GMT Alan Mackenzie wrote:

> I've got a first version of a patch which attempts to handle GPM in
> conjunction with scrolling.  It's imperfect - for example, I can't get it
> to select anything the first 66 lines of the console's displayed boot-up
> messages.  Nevertheless it may be useful.
> 
> In particular, moving the mouse over an already scrolled area no longer
> corrupts that area.  Also, one can select text from a scrolled area.
> 
> To use it, please apply the supplied patch ON TOP OF the patch I posted
> here on 12th December.  Proceed as documented in that post, up until
> configuring the kernel - in Device drivers/Graphic support/Console
> display driver support, there's an extra item "Enable a working GPM for
> scrolled back scrollback buffer in System RAM" which should be enabled by
> default.  Check this is set up properly.  Then build and install the
> kernel.  Then reboot into it and try it out.
> 
> Note that it uses ~twice as much memory as the previous scrolling
> buffers, giving a total of ~three times as much memory used.  This
> shouldn't really be a problem on a modern machine with 16GB or 32GB of
> RAM.
> 
> Please let me know of any problems you encounter with this new facility,
> so that I can try to fix them.  Thanks!

Bad news, I'm afraid. After following your instructions carefully, the new 
kernel hangs early in the boot process. The first time I tried it it seemed to 
be just as the first HID message had been displayed; the second time I didn't 
see that (could be my eyes).

I've attached a photo of the console.


-- 
Regards,
Peter.