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kali linux – The screen turns gray after the connection, nothing happens

Hello, I installed kali linux fresh from an iso file, it worked well, but when I updated with apt-get dist-upgrade, it was stuck on a gray screen after the connection, only the mouse works. I think that might have to do with my graphics card problem.
Processor: Intel i5 5th generation
Graphics: Radeon AMD
Hard disk: 500gb
Kali version before the update: 2018.4

Gray text on black background | Promotion Forum


I noticed the same thing on my forum:

https://thedrumlesson.com/index.php?threads/181/ (may have changed after I edited these things)


In addition, the text is too small. These elements need to be fixed, the text enlarged and a gray tint – as in my old default theme.

computer vision – what do the middle and middle filters do with a n x n kernel (neighborhood) at the gray levels of the image?

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What is gray referencing?


What is gray referencing?

magento2 – Images out of stock – Gray if the products are out of stock in Magento 2

The same code will work. Just add this code in app / design / frontend / packagename / keyword_name / Magento_Catalog / template / product / list.phtml

isSaleable ()): {
echo & # 39;& # 39 ;;
} endif;?>

film – For analog color printing, why is a diffuse projected image "average" to gray?

To obtain a fair color balance, it is necessary to present to the paper a mixture of red, green and blue, exposing the light energy from the projected image of the negative. If the mixture of light exposure is biased as to color or intensity, print results below the standards.

At present, the vast majority of images contain important neutral areas. We speak of black, gray and white of varying densities. If these neutral areas reproduce with a hue of color, an observer will declare it, the image is then discolored. This description is true, most images are gray. To integrate means that we can laminate an impression on a top and run this business at high speed. We will see a blurred image – gray. We can also visualize this gray integration if we optically scramble this image using diffusion.

Note: If the image is composed of large areas of bright color, it will not fit in gray and the method you describe will not give a satisfactory filter pack. Let me add that the method you describe gives a good starter for the majority of typical negatives. I say good start because each print will require filter adjustments and exposures to adjust the print accordingly. In addition, the principle of using a gray card target to measure the exposure is based on the fact that a typical view integrates with a battleship gray with a reflectivity of about 18%.

film – For analog color printing, why is a diffuse projected image still "average" to gray?

By analogically printing a color negative film on RA-4 paper, one solution is to project the image onto the easel, place a diffuser in the path of light, and then place a filter calculator (a series of filters various filtrations magenta + yellow) on top of the paper and make a test print. The filtration on the test print closest to the gray is assumed to be one that is properly balanced for the image. How and why does it work? If I take a picture of a red wall, for example, I would not expect the image to become gray. (Understand that it does not work most of the time.)

performance – Suppression of a rebound of a rotary encoder switch (gray) in C

I would like comments on the accuracy and performance of this code.

My priorities are also readability, simplicity and self-documenting code – but I'm happy with those things.

I still need to factorize the common code between the two input lines – but I'm sweeping my C and I'll do it.

RA2 and RA3 are the two digital input lines. My algorithm is no different from how the rebound would be performed with a low-pass capacitor and a resistor followed by a Schmitt trigger. This function is called by the ISR every 0.5 ms and the rotary switch produces transitions as short as 5-10 ms.

I am curious to know how to deal with situations in which the rotary switch is rotated a little faster than the algorithm can handle it. Can we deduce any other information from Gray's coding, even when a step is missed because of the low turnaround time and the limited sampling frequency? I guess it could go as far as using neural networks ?!

I mainly ask this question because I think the run time and the amount of code below can both be reduced by at least a factor of two. And I would rather not go out of the logic analyzer and reinvent the wheel completely.


#define ROTSW_AVG_SIZE 8
#define ROTSW_MAX 7
#define ROTSW_UPPER 5
#define ROTSW_LOWER 2
#define ROTSW_MIN 0

void rotsw_sample_avg_schmitt_count ();

extern volatile int rotsw_count_steps;


unsigned int rotsw_samples[ROTSW_AVG_SIZE];
unsigned character rotsw_write_idx = 0;

int rotsw_avg_ra2 = 0;
int rotsw_avg_ra3 = 0;

int ra2 = 0;
int ra3 = 0;

volatile int rotsw_count = 0;

void rotsw_sample_avg_schmitt_count ()
int sample, old_sample, ra2_changed, ra3_changed, count = rotsw_count;

// Example RA2 and RA3
old_sample = rotsw_samples[rotsw_write_idx];
rotsw_samples[rotsw_write_idx] = sample = PORTA & 0b00001100;
if (++ rotsw_write_idx> = ROTSW_AVG_SIZE) rotsw_write_idx = 0;

// Moving average, moving from the digital sample to "analog"
if (old_sample & 0x04) rotsw_avg_ra2--;
if (old_sample & 0x08) rotsw_avg_ra3--;
if (example & 0x04) rotsw_avg_ra2 ++;
if (example & 0x08) rotsw_avg_ra3 ++;

// 3. Limit the Schmitt trigger
if (rotsw_avg_ra2 < ROTSW_MIN) rotsw_avg_ra2 = ROTSW_MIN;
    else if (rotsw_avg_ra2 > ROTSW_MAX) rotsw_avg_ra2 = ROTSW_MAX;
if (rotsw_avg_ra3 < ROTSW_MIN) rotsw_avg_ra3 = ROTSW_MIN;
    else if (rotsw_avg_ra3 > ROTSW_MAX) rotsw_avg_ra3 = ROTSW_MAX;

// Do Schmitt trigger
if (rotsw_avg_ra2> ROTSW_UPPER) {
ra2_changed =! ra2;
ra2 = 1;
} else if (rotsw_avg_ra2 < ROTSW_LOWER){
        ra2_changed = ra2;
        ra2 = 0;
    if (rotsw_avg_ra3 > ROTSW_UPPER) {
ra3_changed =! RA3;
ra3 = 1;
} else if (rotsw_avg_ra3 <ROTSW_LOWER) {
ra3_changed = ra3;
ra3 = 0;

// Do not count changes in rotsw state
if (ra2_changed) {
if (ra2 == ra3) account ++;
if not, count;
if (ra3_changed) {
if (ra2 == ra3) counts--;
otherwise account ++;
rotsw_count = count;

How to fix low-quality gray scale printing on HP Color LaserJet CP4525 printers?

When I print in grayscale, gray text and gray areas are printed with small black dots instead of using real gray. How can I fix this?