Wrong priority reporting with new 0(1) scheduler; USB changes to 2.4.18 pre/rc1 breaks HPOJ

Wrong priority reporting with new 0(1) scheduler; USB changes to 2.4.18 pre/rc1 breaks HPOJ

[Con Kolivas]

Priority reporting issue:

I've applied the 0(1) scheduler patch in conjunction with the preemptible 
patch to 2.4.18 pre (sched-O1-2.4.18-pre8-K3.patch and 
preempt-kernel-rml-2.4.18-rc1-ingo-K3-1.patch)

I found that top and other process managers (like kpm) report the priority as 
9 instead of 0 for nice level 0 applications with the preemptible patch, and 
15 with both preemptible and 0(1). Nice'd applications can have their 
priority reported as high as 39. It seems to read it as 15-20 higher than 
the nice value. The kernel appears to work flawlessly otherwise.


USB issue:

The USB changes after 2.4.17 up to and including 2.4.18 rc1 cause the hp 
officejet drivers to fail on my machine. While the usb mouse continues to 
work, the hp ptal-init probe cannot find the device when scanning 
/dev/usb/lp0. The device is still reported correctly in 
/proc/bus/usb/devices. This is with both the usb-uhci and the uhci drivers.

Hardware configuration:
Soltek 65KV apollo pro via motherboard with PIII 933. HP Officejet G55.

Regards,
Con Kolivas

(Please cc: me if any correspondence is appropriate as I am not subscribed to 
lkml)

Re: Wrong priority reporting with new 0(1) scheduler; USB changes to 2.4.18 pre/rc1 breaks HPOJ

[Greg KH]

On Sat, Feb 16, 2002 at 01:29:41AM +1100, Con Kolivas wrote:
> 
> The USB changes after 2.4.17 up to and including 2.4.18 rc1 cause the hp 
> officejet drivers to fail on my machine. While the usb mouse continues to 
> work, the hp ptal-init probe cannot find the device when scanning 
> /dev/usb/lp0. The device is still reported correctly in 
> /proc/bus/usb/devices. This is with both the usb-uhci and the uhci drivers.

There have been some "interesting" discussions about HP printers on the
linux-usb-devel mailing list :)

A very simple patch that might work for you is at:
	http://marc.theaimsgroup.com/?l=linux-usb-devel&m=101338636901219
while a more "correct" patch is at:
	http://marc.theaimsgroup.com/?l=linux-usb-devel&m=101366701613394

Please let me know if either of these patches fix your problem.

thanks,

greg k-h