Re: recurring problem, booting git-built to black screen with intel GPU

for the working 2.6.37-rc5+ kernel is identical other than the kernel version references, of course. rday -- Robert P. J. Day Waterloo, Ontario, CANADA http

Re: Kernel compilation

-- Robert P. J. Day Waterloo, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

anyone know of a resolution for the intel i915 black screen issue?

but everything lately still gives me a black screen. rday -- Robert P. J. Day Waterloo, Ontario, CANADA http://crashcourse.ca Twitter: http

i see the intel i915 black screen issue is back

just built a new kernel for ubuntu 10.10 (2.6.38-rc2) and, depressingly, this kernel once again boots to a black screen given the intel i915 onboard video. this is getting frustrating. rday -- Robert P. J. Day

Re: i see the intel i915 black screen issue is back

cannot reproduce this (Arch Linux). Boot works as expected. ok, i'll try again and make sure it wasn't something stupid i did. rday -- Robert P. J. Day Waterloo, Ontario, CANADA

Re: i see the intel i915 black screen issue is back

On Wed, 26 Jan 2011, Greg KH wrote: On Tue, Jan 25, 2011 at 09:34:48PM -0500, Robert P. J. Day wrote: just built a new kernel for ubuntu 10.10 (2.6.38-rc2) and, depressingly, this kernel once again boots to a black screen given the intel i915 onboard video. this is getting frustrating

Re: i see the intel i915 black screen issue is back

On Wed, 26 Jan 2011, Greg KH wrote: On Tue, Jan 25, 2011 at 09:34:48PM -0500, Robert P. J. Day wrote: just built a new kernel for ubuntu 10.10 (2.6.38-rc2) and, depressingly, this kernel once again boots to a black screen given the intel i915 onboard video. this is getting frustrating

apparent workaround for i915 black screen issue

and wants to test the above, it would be nice to verify that this workaround works for someone else. rday -- Robert P. J. Day Waterloo, Ontario, CANADA http

if you're in ottawa this tuesday, come out and say hi

i'm giving a short presentation at the ottawa linux users group this tuesday evening: http://oclug.on.ca/meeting/70/ so if you're in the area, drop by and introduce yourself. rday -- Robert P. J. Day

Now getting settled in Ottawa, in case you cared :-)

area, drop me a note. See you at the next OCLUG meeting: http://oclug.on.ca/meeting/74/. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca

perhaps confused about operation of alloc_chrdev_region()

; i see no reason to initialize it to anything since alloc_chrdev_region() is supposed to treat the dev_t parameter as output only, is it not? am i missing something here? rday -- Robert P. J. Day

Re: perhaps confused about operation of alloc_chrdev_region()

won't *compile* it since it's strictly for powerpc, but i'll just submit the patch to the ppc list and let them make the decision. i just wanted to verify that i wasn't hopelessly confused. rday -- Robert P. J. Day

question about misc char devices, and relationship with udev

into existence without any obvious help from udev. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http

thinking of updating the canonical online udev document

through the current document, check it against your system, post differences or updates, and i'll collect them all and eventually write up an updated version and post it somewhere. rday -- Robert P. J. Day

looking for decent summary of kernel debugging primitives

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

Re: looking for decent summary of kernel debugging primitives

tools, i was just trying to summarize the variations of simple printing/logging for now. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

confused by char dev registration in a gpio driver

time? this second point is more nitpicky, but what about that first point? wouldn't a successful registration always print an allocated major number of zero? rday -- Robert P. J. Day

Re: if cdev_add() fails, do you need to put the cdev's kobject?

On Tue, 3 May 2011, Greg KH wrote: On Tue, May 03, 2011 at 05:46:05PM -0400, Robert P. J. Day wrote: still perusing various drivers to use as examples in class, and i ran across this snippet in the load routine of drivers/char/raw.c: = start excerpt = cdev_init

registering a character driver without cdev_init()/cdev_add()

way to register character drivers? i don't think i've run across any other drivers that have this structure but, then again, i haven't been looking that hard. yet. rday -- Robert P. J. Day

Re: registering a character driver without cdev_init()/cdev_add()

of the above, nice to have it confirmed, though. thanks. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

anyone using sysfsutils in a practical way?

* it for useful things, as opposed to just playing with it? i'll probably get around to checking it out this weekend, just curious as to how i'd promote its use if/when the time comes. thanks. rday -- Robert P. J. Day

Re: anyone using sysfsutils in a practical way?

, thanks. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn

Re: anyone using sysfsutils in a practical way?

On Fri, 6 May 2011, Greg KH wrote: On Fri, May 06, 2011 at 10:25:08AM -0400, Robert P. J. Day wrote: and i want to more emphasize kobjects and sysfs. to that end, i'm aware of the sysfsutils package, although i haven't used it yet. It's obsolete, and doesn't work on modern kernels

so what's the deal with the proposed /sys/subsystem?

,class,block}. so what's the current status of this subsystem directory? is there a timeline for this? just curious. rday -- Robert P. J. Day Ottawa, Ontario, CANADA

rationale for sysfs attr store/show accepting kobj_attribute?

the enclosing attribute structure, there's always container_of, but i'd just like to know if there was a reason for the choice that was made. rday -- Robert P. J. Day Ottawa, Ontario, CANADA

do all kobjects in a kset need to be the same ktype?

. -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

Re: do all kobjects in a kset need to be the same ktype?

On Tue, 10 May 2011, Greg KH wrote: On Tue, May 10, 2011 at 07:07:18AM -0400, Robert P. J. Day wrote: can someone clarify this? Have you read Documentation/kobjects.txt first? ah, quite so, thanks. rday

Re: rationale for sysfs attr store/show accepting kobj_attribute?

On Tue, 10 May 2011, Jim Cromie wrote: On Sun, May 8, 2011 at 3:23 AM, Robert P. J. Day rpj...@crashcourse.ca wrote:  more just a curiosity than anything else, but i'm perusing the kobject sample programs in the kernel source directory and in kobject-example.c, there's one thing about

any real or previous usage of the IRQ-related seqlock calls?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

is the tickless kernel now the standard?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

Re: is the tickless kernel now the standard?

On Sun, 15 May 2011, Greg KH wrote: On Sun, May 15, 2011 at 12:41:30PM -0400, Robert P. J. Day wrote: given that ubuntu ships with the kernel configured for tickless behaviour, and that RHEL6 also ships tickless, is it safe to say that tickless is now the standard configuration

should drivers avoid the use of in_atomic()?

. is that admonition overly strict? or what? rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http

first downtown ottawa linux kernel geek-up, next tuesday, may 24

http://crashcourse.ca/blog/201105/inaugural-downtown-ottawa-linux-geek-tues-may-24-5-pm rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca

Re: first downtown ottawa linux kernel geek-up, next tuesday, may 24

On Fri, 20 May 2011, Dave Hylands wrote: HI Robert, On Fri, May 20, 2011 at 7:10 AM, Robert P. J. Day rpj...@crashcourse.ca wrote: http://crashcourse.ca/blog/201105/inaugural-downtown-ottawa-linux-geek-tues-may-24-5-pm That link gives a page-not-found not sure what happened

Re: how to download a specific kernel version from kernel.org

to download that? all of the tarballs should be here: ftp://ftp.kernel.org/pub/linux/kernel/v2.6/ i can see the 2.6.35 tarball in that list. rday -- Robert P. J. Day Ottawa, Ontario, CANADA

Re: knewbies project? - updating LDD3 source

proc files anymore. also, ioctl()s are also discouraged for the most part. so i would be selective about what parts of LDD3 code *should* be updated as examples of good kernel programming. rday -- Robert P. J. Day

Re: knewbies project? - updating LDD3 source

On Tue, 24 May 2011, Leon Woestenberg wrote: Hello all, On Tue, May 24, 2011 at 10:26 PM, Robert P. J. Day rpj...@crashcourse.ca wrote: On Tue, 24 May 2011, Javier Martinez Canillas wrote: On Tue, May 24, 2011 at 8:14 PM, DG dang...@gmail.com wrote: On Tue, May 24, 2011 at 11:47 AM

how to run MMC tests on my ubuntu laptop?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: Rv: Re: knewbies project? - updating LDD3 source

the uevents in user space to see how they match up. mostly, just pick a kernel feature and start writing and posting. others will tell you if you're on the right track. rday -- Robert P. J. Day

Re: should failed calls to device_register() always call put_device()?

On Sat, 28 May 2011, Belisko Marek wrote: Hi Robert, On Sat, May 28, 2011 at 5:15 PM, Robert P. J. Day rpj...@crashcourse.ca wrote:  from drivers/base/core.c, we have the fairly unambiguous advice: * NOTE: _Never_ directly free @dev after calling this function, even

Re: should failed calls to device_register() always call put_device()?

On Sat, 28 May 2011, Belisko Marek wrote: On Sat, May 28, 2011 at 6:29 PM, Robert P. J. Day rpj...@crashcourse.ca wrote:  i agree that there should be a put_device(dev-dev); statement as you show above.  however, i still don't see how this can be just a stylistic improvement as you

Re: should failed calls to device_register() always call put_device()?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: should failed calls to device_register() always call put_device()?

On Sun, 29 May 2011, Greg KH wrote: On Sun, May 29, 2011 at 07:21:10AM -0400, Robert P. J. Day wrote: what is apparently *not* OK is to either call kfree() *before* calling put_device(), or to call kfree() and nothing else upon a failed device_register() call. some apparently broken

3.0.0-rc? kernel suddenly loses sound on my ubuntu 11.10 system

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: 3.0.0-rc? kernel suddenly loses sound on my ubuntu 11.10 system

is ok again. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn

Re: why backtiks for a word?

the original poster meant until he clarifies it. the connection to the linux kernel here is still entirely unclear. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http

can i simply re-version the kernel down to 2.x?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

issues regarding using initramfs for entire root fs?

said, it's not meant to be practical so much as just a demo of it being a possibility. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca

Re: what is the + sigh in the modules folder name?

fi rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday

Re: what is the + sigh in the modules folder name?

documenting it once upon a time. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com

Re: what is the + sigh in the modules folder name?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com

Re: function of major/minor device number

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

want to verify equivalence of Kconfig variants

into the directory itself to learn of it. thoughts? is there anything i'm not noticing about this? rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca

Re: New version of beginner's kernel programming course coming soon

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

all free content for new kernel programming course is now up

to write and run your first loadable kernel module, help yourself. those lessons are entirely free and have no expiration -- they'll never disappear. enjoy. rday -- Robert P. J. Day Ottawa

ubuntu 11.10, systemtap and building my own kernel

not exist. am i doing something silly? can someone else with an ubuntu system try this and let me know what happens? thanks. rday -- Robert P. J. Day Ottawa, Ontario, CANADA

Re: ubuntu 11.10, systemtap and building my own kernel

a next member field that is required by this version of systemtap (1.4). can you clarify which kernel version(s) would have worked with this version of systemtap? thanks. rday -- Robert P. J. Day

Re: ubuntu 11.10, systemtap and building my own kernel

On Tue, 10 Apr 2012, Frank Ch. Eigler wrote: Hi - On Tue, Apr 10, 2012 at 04:17:25PM -0400, Robert P. J. Day wrote: [...] just FYI, this is the current problem: [...] Yup, found it. For now, you could adjust your copy of the runtime.h header file s/map/mask/ and have at it. We'll

where is the formula for calculating kernel process priority?

in which source file is the actual formula for calculating a process' priority based on its niceness, behaviour, etc? thanks. rday -- Robert P. J. Day Ottawa, Ontario, CANADA

anyone know what a lockless ioctl is?

...0.0.noPYe58Fdcgpbx=1bav=on.2,or.r_gc.r_pw.r_qf.,cf.osbfp=f4bd7f4bc3a9df92biw=1060bih=925 did such a thing ever exist? rday -- Robert P. J. Day Ottawa, Ontario, CANADA

could some current.h files be simplified?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn

Re: Syscalls: When can I use cond_syscall() macro?

, such as make modules_prepare. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http

why does proc_create_data() test for S_ISDIR(mode)?

as thoroughly as i might have, but ... thoughts? is that S_ISDIR test as redundant as i think it is? rday -- Robert P. J. Day Ottawa, Ontario, CANADA http

where is the /sys/bus kobject created?

hints? rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn

*must* a kset have an associated uevent_ops field?

the code so that that test is done early, and reduces the subsequent code? just curious. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

Re: Linux Kernel Development

not ready. it's like saying, gee, i'd really like to be a car mechanic, but i've never looked under the hood. how do i get started? go learn C first. then you can at least take a shot at it. rday -- Robert P. J. Day

combining make O= and oldconfig when configuring a kernel?

../build [create a build directory] $ cp some config file ../build/.config $ make O=../build oldconfig and take it from there. does that sound right? rday -- Robert P. J. Day

FYI, open-sourced kernel, device driver and android courseware

time. :-) rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn

what's with the zeroing out of memory when kexec is configured?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

an online kernel crash book, and wondering what's deprecated

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: LDT - Linux Driver Template

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

looking for current, online kernel-related tutorials

that to the wiki where everyone can take advantage. and now, back to work ... rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

why so little usage of DEFINE_SEMAPHORE()?

that it's almost non-existent. thoughts? rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http

what's with get_cpu_ptr and put_cpu_ptr?

them out given a bit more time, but anyone want to clarify the purpose of those macros? and perhaps whether they're rarely used because normal kernel programmers shouldn't be using them? thanks. rday -- Robert P. J. Day

how many contexts are there?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com

why only some sysfs attribute callbacks use attribute pointers?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

kobj_attribute and followup to earlier post

curiosity -- why were *some* sysfs attribute show/store callbacks defined as accepting an attribute pointer (allowing them to multiplex among attributes) while others weren't? was there some rationale for this? rday -- Robert P

short tutorial on kobjects, attributes and sysfs

http://www.crashcourse.ca/wiki/index.php/Kernel_kobjects enjoy. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

new tutorial: ktypes

. so before i publicize that new ktypes tutorial on my twitter and linkedin accounts, any feedback? more later ... rday -- Robert P. J. Day Ottawa, Ontario, CANADA

compelling reason to use a kset in kernel code?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: compelling reason to use a kset in kernel code?

, other than to simply have the kobject /sys/fs/btrfs appear under /sys? or is that the whole purpose here? rday -- Robert P. J. Day Ottawa, Ontario, CANADA http

Re: any way to see the running kernel's vermagic string?

); return -ENOEXEC; } ... snip ... it's not that big a deal, but it would be informative to be able to see the kernel's full vermagic string. rday -- Robert P. J. Day Ottawa

any history to class.txt's devclass_attribute?

doesn't appear to explain how it came to be. anyone know what the story is behind devclass_attribute? methinks it can be tossed from the current Documentation. thoughts? rday -- Robert P. J. Day

Re: looking for current, online kernel-related tutorials

the next few weeks, much will be updated and re-organized, and i'll post pointers to whatever goes up. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca

quick online tutorial on system calls

of got away from me): http://www.crashcourse.ca/wiki/index.php/System_calls but a lot of it is just cutting and pasting kernel source for explanatory purposes. feedback welcome. rday -- Robert P. J. Day

Re: looking for current, online kernel-related tutorials

/index.html that is, a solid coverage of a single topic in some detail, particularly if it can tie back into code taken from the kernel. anyway, off to write more tutorials. rday -- Robert P. J. Day

Re: looking for current, online kernel-related tutorials

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: looking for current, online kernel-related tutorials

). at this point, i don't see any other way to do this that's as effective. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

another kernel tutorial: tasklets

http://www.crashcourse.ca/wiki/index.php/Tasklets next up ... work queues. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

some weird redundancy with a workqueue?

, acpi_os_execute_deferred); else INIT_WORK(dpc-work, acpi_os_execute_deferred); does anyone else find that code a bit ... odd? rday -- Robert P. J. Day Ottawa, Ontario, CANADA

if flush_scheduled_work() is allegedly overkill, why do drivers use it?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

Re: if flush_scheduled_work() is allegedly overkill, why do drivers use it?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http

more on work queues -- why is deprecated flush_scheduled_work still used?

-- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday

/proc/cpuinfo versus /proc/softirqs: how to properly count CPUs?

to the basic question -- why is the code for softirqs iterating through all *possible* CPUs (in my case, apparently, 16), when i have only 8 *online* CPUs? rday -- Robert P. J. Day Ottawa

Re: /proc/cpuinfo versus /proc/softirqs: how to properly count CPUs?

On Mon, 22 Oct 2012, Vijay Chauhan wrote: On Mon, Oct 22, 2012 at 7:30 PM, Robert P. J. Day rpj...@crashcourse.ca wrote: poking around under /proc on my quad-core asus laptop and just noticed that while /proc/cpuinfo (properly) lists my 8 processors, /proc/softirqs instead lists 16

online, possible and disabled cpus

to keep following this back, unless someone wants to break it to me what is going on. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter

Re: online, possible and disabled cpus

flogged this enough. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday

Re: online, possible and disabled cpus

On Tue, 23 Oct 2012, Srivatsa Bhat wrote: Hi, On Tue, Oct 23, 2012 at 12:43 AM, Robert P. J. Day rpj...@crashcourse.ca wrote: On Mon, 22 Oct 2012, Srivatsa Bhat wrote: Hi, You might want to take a look at Documentation/cpu-hotplug.txt for some details regarding online/possible

Re: online, possible and disabled cpus

files have that option turned on. seriously, how many people out there are hotplugging CPUs? i'm just curious. and is there any obvious drawback to just unconfiguring that option? rday -- Robert P. J. Day

looking for simple kernel source examples of, well, everything

somewhere public. rday -- Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn

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